[en] The monazite supergroup minerals represent anhydrous phosphates, less frequently arsenates, silicates, and chromates with general formula ABX4, monoclinic symmetry, space group P21/n (14), and Z = 4. The A site is occupied usually by REE (La3+ to Gd3+) and other large divalent to tetravalent cations (mainly Ca2+, Pb2+, Bi3+, Th4+, and U4+) in nine-fold coordination. The B-site is filled with cations in tetrahedral coordination (mainly P5+ and As5+, in specific cases also Si4+, Cr6+ and other cations). The anionic X site is usually occupied by O2- but may be replaced to a small extent by F- or (OH)- anion. The supergroup is divided into one group: monazite (phosphates, arsenates, vanadates), and two unassigned members: huttonite (silicates) and crocoite (chromates, sulfates). Recently, eleven valid mineral species of the monazite supergroup have been approved by CNMNC IMA: monazite-(La), monazite-(Ce), monazite-(Nd), monazite-(Sm), monazite-(Gd), cheralite, gasparite-(La), gasparite-(Ce), rooseveltite, huttonite, and crocoite. Besides that, mineral analyses and synthetized compounds indicate the potential existence of several other new members of the monazite supergroup in natural environments.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Uher, Pavel; Department of Mineralogy, Petrology and Economic Geology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
Hatert, Frédéric ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Ondrejka, Martin; Department of Mineralogy, Petrology and Economic Geology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
Bačík, Peter; Department of Mineralogy, Petrology and Economic Geology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia ; Earth Science Institute, Slovak Academy of Sciences, Bratislava, Slovakia
Sejkora, Jiří; Department of Mineralogy and Petrology, National Museum, Prague 9, Czech Republic
Škoda, Radek; Department of Geological Sciences, Faculty of Science, Masaryk University, Brno, Czech Republic
Števko, Martin; Earth Science Institute, Slovak Academy of Sciences, Bratislava, Slovakia ; Department of Mineralogy and Petrology, National Museum, Prague 9, Czech Republic
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